Though an early frost is setting in outside of your shelter, the Marmot Never Summer MemBrain Sleeping Bag will have you dreaming of the hot sun and sandy beaches. Stuffed with oodles of ultra-warm, lightweight 600-fill goose down and wrapped in Marmot's waterproof breathable MemBrain 2L fabric, the Never Summer keeps the cold at bay while simultaneously protecting your down insulation from condensation and spindrift.